package com.example.lancooznbk.view.widget;


import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Movie;
import android.os.Build;
import android.support.annotation.NonNull;
import android.util.AttributeSet;
import android.view.View;

import com.example.lancooznbk.R;


public class GifView extends View {  
  
    /** 
     * 默认为1秒 
     */  
    private static final int DEFAULT_MOVIE_DURATION = 1000;  
  
    private int mMovieResourceId;  
  
    private Movie mMovie;  
  
    private long mMovieStart;  
  
    private int mCurrentAnimationTime = 0;  
  
    private float mLeft;  
  
    private float mTop;  
  
    private float mScale;  
  
    private int mMeasuredMovieWidth;  
  
    private int mMeasuredMovieHeight;  
  
    private boolean mVisible = true;  
  
    private volatile boolean mPaused = false;  
  
    public GifView(Context context) {  
        this(context, null);  
    }  
  
    public GifView(Context context, AttributeSet attrs) {  
        this(context, attrs, R.styleable.ggfx_CustomTheme_ggfx_gifViewStyle);
    }  
  
    public GifView(Context context, AttributeSet attrs, int defStyle) {  
        super(context, attrs, defStyle);  
        setViewAttributes(context, attrs, defStyle);  
    }  
  
    @SuppressLint("NewApi")  
    private void setViewAttributes(Context context, AttributeSet attrs,  
            int defStyle) {  
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {  
            setLayerType(View.LAYER_TYPE_SOFTWARE, null);  
        }  
        // 从描述文件中读出gif的值，创建出Movie实例  
        final TypedArray array = context.obtainStyledAttributes(attrs,  
                R.styleable.ggfx_GifView, defStyle, R.style.Widget_AppCompat_ActionBar_TabView);
        mMovieResourceId = array.getResourceId(R.styleable.ggfx_GifView_ggfx_gif, -1);
        mPaused = array.getBoolean(R.styleable.ggfx_GifView_ggfx_paused, false);
        array.recycle();  
        if (mMovieResourceId != -1) {  
            mMovie = Movie.decodeStream(getResources().openRawResource(  
                    mMovieResourceId));  
        }  /*else{
        	 mMovie = Movie.decodeStream(getResources().openRawResource(  
                     R.drawable.loading_view_icon));
        }*/
    }  
  
    /** 
     * 设置gif图资源 
     *  
     * @param movieResId 
     */  
    public void setMovieResource(int movieResId) {  
        this.mMovieResourceId = movieResId;  
        mMovie = Movie.decodeStream(getResources().openRawResource(  
                mMovieResourceId));  
        requestLayout();  
    }  
  
    public void setMovie(Movie movie) {  
        this.mMovie = movie;  
        requestLayout();  
    }  
  
    public Movie getMovie() {  
        return mMovie;  
    }  
  
    public void setMovieTime(int time) {  
        mCurrentAnimationTime = time;  
        invalidate();  
    }  
  
    /** 
     * 设置暂停 
     *  
     * @param paused 
     */  
    public void setPaused(boolean paused) {  
        this.mPaused = paused;  
        if (!paused) {  
            mMovieStart = android.os.SystemClock.uptimeMillis()  
                    - mCurrentAnimationTime;  
        }  
        invalidate();  
    }  
  
    /** 
     * 判断gif图是否停止了 
     *  
     * @return 
     */  
    public boolean isPaused() {  
        return this.mPaused;  
    }  
  
    @Override  
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  
        if (mMovie != null) {  
            int movieWidth = mMovie.width();  
            int movieHeight = mMovie.height();  
            int maximumWidth = MeasureSpec.getSize(widthMeasureSpec);  
            float scaleW = (float) movieWidth / (float) maximumWidth;  
            mScale = 1f / scaleW;  
            mMeasuredMovieWidth = maximumWidth;  
            mMeasuredMovieHeight = (int) (movieHeight * mScale);  
            setMeasuredDimension(mMeasuredMovieWidth, mMeasuredMovieHeight);  
        } else {  
            setMeasuredDimension(getSuggestedMinimumWidth(),  
                    getSuggestedMinimumHeight());  
        }  
    }  
  
    @Override  
    protected void onLayout(boolean changed, int l, int t, int r, int b) {  
        super.onLayout(changed, l, t, r, b);  
        mLeft = (getWidth() - mMeasuredMovieWidth) / 2f;  
        mTop = (getHeight() - mMeasuredMovieHeight) / 2f;  
        mVisible = getVisibility() == View.VISIBLE;  
    }  
  
    @Override  
    protected void onDraw(Canvas canvas) {  
        if (mMovie != null) {  
            if (!mPaused) {  
                updateAnimationTime();  
                drawMovieFrame(canvas);  
                invalidateView();  
            } else {  
                drawMovieFrame(canvas);  
            }  
        }  
    }  
  
    @SuppressLint("NewApi")  
    private void invalidateView() {  
        if (mVisible) {  
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {  
                postInvalidateOnAnimation();  
            } else {  
                invalidate();  
            }  
        }  
    }  
  
    private void updateAnimationTime() {  
        long now = android.os.SystemClock.uptimeMillis();  
        // 如果第一帧，记录起始时间  
        if (mMovieStart == 0) {  
            mMovieStart = now;  
        }  
        // 取出动画的时长  
        int dur = mMovie.duration();  
        if (dur == 0) {  
            dur = DEFAULT_MOVIE_DURATION;  
        }  
        // 算出需要显示第几帧  
        mCurrentAnimationTime = (int) ((now - mMovieStart) % dur);  
    }  
  
    private void drawMovieFrame(Canvas canvas) {  
        // 设置要显示的帧，绘制即可  
        mMovie.setTime(mCurrentAnimationTime);  
        canvas.save(Canvas.MATRIX_SAVE_FLAG);  
        canvas.scale(mScale, mScale);  
        mMovie.draw(canvas, mLeft / mScale, mTop / mScale);  
        canvas.restore();  
    }  
  
    @SuppressLint("NewApi")  
    @Override  
    public void onScreenStateChanged(int screenState) {  
        super.onScreenStateChanged(screenState);  
        mVisible = screenState == SCREEN_STATE_ON;  
        invalidateView();  
    }  
  
    @SuppressLint("NewApi")  
    @Override  
    protected void onVisibilityChanged(@NonNull View changedView, int visibility) {
        super.onVisibilityChanged(changedView, visibility);  
        mVisible = visibility == View.VISIBLE;  
        invalidateView();  
    }  
  
    @Override  
    protected void onWindowVisibilityChanged(int visibility) {  
        super.onWindowVisibilityChanged(visibility);  
        mVisible = visibility == View.VISIBLE;  
        invalidateView();  
    }  
  
}  